Aarhus University Seal / Aarhus Universitets segl

No. 142: Hazardous substances and metals in the aquatic environment. NOVANA. State and trends 2004-2012

Boutrup, S., Holm, A.G., Bjerring, R., Johansson, L.S., Strand, J., Thorling, L., Brüsch, W., Erntsen, V., Ellermann, T. & Bossi, R. 2015. Miljøfremmede stoffer og metaller i vandmiljøet. NOVANA. Tilstand og udvikling 2004-2012. Aarhus Universitet, DCE – Nationalt Center for Miljø og Energi, 242 s. - Videnskabelig rapport fra DCE - Nationalt Center for Miljø og Energi nr. 142. http://dce2.au.dk/pub/SR142.pdf

Summary

In this report, the result of monitoring hazardous substances and metals in the aquatic environment as part of the NOVANA programme has been summarized. Monitoring includes the sources of the substances being deposited into the aquatic environment, e.g. precipitation and dry deposition from the air and wastewater. The aquatic environment comprises groundwater and fresh and marine surface waters. Monitoring surface water involves studying both water, sediment and biota.

The report includes data from the period 2004 to 2012 and for fresh water and some of the point sources also data from 2013. Data are presented describing the concentrations of the individual substances and, to the extent that quality standards or assessment criteria from conventions exist, the detected concentrations are assessed against them.

A description of the temporal development has been included to the extent that data were sufficient. In cases where it was not possible to demonstrate statistically significant decreasing or increasing concentration levels, it cannot be excluded that it may have been possible to demonstrate a trend with more data. Thus, it may be expected that monitoring in the coming years will contribute to demonstrating trends to a larger extent.

Data are included from several point sources and, to the extent that there has been sufficient data, the average annual amount of deposition from each source point has been calculated.

Operational monitoring of fresh water is organized as campaigns that study lakes and streams, where stormwater discharge from separate and combined sewers is a potential source in the catchment that may affect water bodies, and in another campaign, water areas in which agriculture and scattered dwellings are potential sources are examined. A statistical analysis of possible differences in the concentration of the substances in water bodies having different potential sources has been carried out.

The report includes a review of substance groups that have been part of monitoring in the period 2004 to 2012/2013.